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#define MI_PFN_ELEMENT_TO_INDEX(_Pfn) ((PFN_NUMBER)(((ULONG_PTR)(_Pfn) - (ULONG_PTR)MmPfnDatabase) / sizeof (MMPFN))) | |
void MiChangePageAttribute(_MMPFN *pfn, MI_PFN_CACHE_ATTRIBUTE cacheAtrribute, bool pfnLocked) { | |
KIRQL irql; | |
if(pfnLocked || someThreadPointer == KeGetCurrentThread()) // no idea what it is | |
irql = 17; | |
else | |
irql = MiLockPageInline(pfn); | |
currCacheAttribute = pfn->u3.e1.CacheAttribute; | |
if(MiPageCombiningActive(0)) { | |
MiAbortCombineScan(pfn); | |
someMask = 0xFB; | |
} | |
else | |
someMask = pfnLocked; | |
pfn->u3.e1.CacheAttribute = cacheAtrribute; | |
if(currCacheAttribute != 3 && !(someMask & 4)) { | |
uint8_t flushStamp = pfn->u2.TbFlushStamp; | |
KeMemoryBarrier(); | |
uint8_t flushDelta = (KiTbFlushTimeStamp[0] - flushStamp) & 0xF; | |
if(someMask & 2 || (flushDelta <= 2 && (flushStamp & 1 || flushDelta < 2))) | |
MiFlushEntireTbDueToAttributeChange(); | |
if(cacheAtrribute != MiCached && currCacheAttribute == 1) | |
{ | |
++dword_1403D87B4; | |
KIRQL irql = KeRaiseIrqlToDpcLevel(); | |
MiFlushCacheForAttributeChange(MI_PFN_ELEMENT_TO_INDEX(pfn), 1, cacheAttribute); | |
KeLowerIrql(irql); | |
} | |
} | |
if (irql != 17) { | |
_InterlockedAnd64(&pfn->u2.Lock, 0x7FFFFFFFFFFFFFFF); // set Lock bit to 0 | |
KeLowerIrql(irql); // rest IRQL | |
} | |
} |
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